Superheater.



J. M. MGGLELLON.

SUPERHEATBR.

' APPLICATION FILED DEO. 5, 1906. 1,038, 1 '72. Patented sept. 1o, 1912.

. 2 SHBBTS-SHEBT 1.

lQ Q www 9m QW QW QN JAMES M. LICCLELLON, OF EVEBETT, MASSACHUSETTS.

surnnnnarnn.

Speculation o! Letters Intent.

Patented Sept. 10, 1912.

Original application led January 30, 1905, Serial No. 243,858. Dividedand this application led December To all whom it may concern:

Be it known that I, JAMES M. McCLEL- Lon, a citizen of the UnitedStates, and a resident of Everett, in the county off'Middlesex and Stateof Massachusetts, have invented an Im rovement in Superheaters, of whichthe fol owing description, in connection with the accompanying drawing,1s u. specilication, like letters on the drawing representlng likeparts.

This invention relates to superheaters for steam boilers, and in makingthe invention my aim has been to provide a novel superheater which iseffective in operation, and so constructed that it will not becomechoked or clogged with soot or ashes.

My invention is particularly adapted for use 1n connection withlocomotive boilers, but it may also be used with boilers of other types.I have, however, chosen to herein illustrate it in connection with alocomotive boiler, and in the drawings Figure 1 is a vertical sectionthrough a. locomotive boiler showing one form of my invention; Fig. 2 isan enlarged vertical section at the end of the boiler showing the mannerof connecting the steam dome with the superheat-4 ing tubes; Fig. 3 is asimilar view to Fig. 2 showin a slightly modified construction; Fig. l1s a vertical section through a locomotive boiler of the ordinary typehaving a crown sheet showing my inventlon applied thereto; Fig. 5 is ahorizontal section on the line :1u-m, Fig. 4; Fig. 6 is a sectional viewshowing a modified form of the invention.

The boiler shell 3 has at one 'end a fire-box or combustion chamber 7and at the other end a smolrechamber 8 and also has the two Hue sheets land 5 between which extend the flues 6. These parts are or ma be all asusually found in locomotive boilers and form no part of my presentinvention.

l have herein illustrated my invention as embodied in two di'erent typesof locomotive boilers. In Fig. 1, I have illustrated a l l le ol boilersuch as is shown and descrid in my Patent No. 870,455 dated November 6,1907, and in Fig. 4 I have illus- 1hr-'ated e locomotive boiler of thetype now in common use. l

In the boiler shown in Fig. 1, the: steam dome 9 is in the form of adrum which extends longitudinally of the boiler above the re-box, andthe water spaees 2 around the fire-box are separate om the. space or beemployed for I, 190C. Serial lo. V$10,867.

chamber 11 within the body of the shell 3 between the flue sheets 4 and5. The latter spacoisflled .completely full of water and provision ismade or delivering water from the top of this chamber into the bottom ofthe water spaces around the lire box. This may conveniently be done by apipe arranged' in the shell having its upper end near the' top thereofand its lower end opening into fire box, all as shown in said Patent No.870,455, although as this construction of boiler forms no part of the.present invention, I have not deemed it necessary to illustrate itherein. The steam passes to the steam dome. The combustion chamber ofthe fire box may have therein a plurality of water tubes'which extenddiagonally there across all as shown in said patent, but to avoidconfusion in the drawin omitted to show such water tu e herein. For amore complete description of this`con' struction of boiler reference maybe had-to my aforesaid Patent No. 870,455.

In the embodiment of the'invention illus- 80 trated in Fig. 1, thechamber 11 has extend-` ing therethrough an enlarged flue 12 which opensat one end into the smoke-chamber 8 and at the other end into thecombustionchamber 7 so that hot products of combustion may pass throughsaid flue. Situated within the line 12 are a plurality of superheatingtubes 13 which communicate at one end with the steam dome 9 and at theother end. with a pipe or pipes engine cylinders. These superheatingtubes 13 extend not only through the flue 12, but also into thecombustiomchamber of the firebox, and in the type of boiler shown inFig. 1, it is possible to extend them through both the line-box and theflue 12 without bendin them at all or without providing them wit elbowsor bends. Any suitable means may establishing communication between themand the steam-dome, and in Figs. 2 and 3 I have shown two ways of doingthis. In Fig. 2 the steam-dome has communication with a steam-chamber 15through a suitable connection 16 and port 17, andthe superheating tubes18 are connectcd to the chamber 15 by means of an ex-l pension-joint. Asherein shown, they are connected to the partition 18 of an expensionmember which is slidably mounted 'in an aperture in one wall of thesteam- 110 the Water space at the rear of the Iv have 7.5

14 leading to the 90 ldd chamber 15, and in' order to make a steam tightjoint between this ex ansion member and the steam-chamber 15, preferablyemploy suitable packing 19 which surrounds the expansionl member andwhich, is heldin place by a clamping member, 20, the position of whichmay be adjusted to 'clamp the packing rmly inv place "by mean's'ofan-ad- Justing screw 21. 22 is a vthrottle'valve which may be employedto control communi-- cation between the steam-dome 9 and super- I',

tubes 13. This construction perheatin mits t e su erheating tubes toexpand `or contract in ependently ofthe otherl parts of the boiler. -i fThe construction shown in Fig. 3 is substantially like that shown inFig..2 with this exception that' in Fig. 2 the steam-chamber 15 isformed-with an end 23 throu h the aperture in which the expansion .mem`r-18T is received, while in Fig. 3 saidy expansion member slides backand forth in a ring 24 which is secured within the openin '25 formed inthe end of the fire-box, an the, packing 19 is received bet-weenVsa-idring and the clamping member 20. In this form of the invention also theclamping member 20 is held in' position by .a plurality of clampingvscrews 28 acting near the peripliery thereof instead of a singleclamping screw acting near the center thereof. In other respects,however, the twofdevices are alike. 29 designates a throttle-valve whichis situated within the smoke-chamber 8. This valve may be operated by asuitable stem 30 which extends through one of the superheating tubes 13and leads to an accessible point within the cab of the engine.

In the boiler constructed as above described the steam which isgenerated in the steam-generating spaces 2 passes to the drum 9, all asshown in my co-pending application, and from the drum the steam passesto the chamber 15, and from the latter through the su erheating tubes 13and thence to the cylin ers. In passing through the superheating tubesthe steam becomes su erheated, as vwill beobvious.

ith the construction above described each of the superheating tubes isstraight and without an bends or turns, and consequently said tu es formno appreciable obstruction to the passage of the hot gases through theue 12, and there is no danger of said ue becoming clogged.

In Fig. 4 I have illustrated my invention as applied to the type ofboiler now commonly in use in which the tire-box is provided with acrown-sheet 31, and in which the spaces around the fire-box communicatewith the space between the flue sheets within thebody yof the shell. Inthis type of boiler' the space within the shell constitutes a steam andwater space, and as the steam is Vgenerated it fills theupper part ofsaid space f'- chamber.

and the dome 32.l In applying m invention to this ty e of boiler Iprovide tie combustion-cham er with an extension 33 which is 'hereinshown as situated above the crownsheet 31. One end of the enlarged iiue12 communicates with this extension 33, the

other end of said flue 12 communicating with said smoke-chamber, asshown in Fig.

iinunica'te at one end -'with the pipes 14 leadmg to the ,enginecylinder and at the'other end they communicate with the steam-dome 32through a suitable connection 16. These superheating tubes extend notonly through the flue v12 but also through a portion of thecombustion-chamber, this portion being the extension 33 in the presentembodiment.;

In this form of the invention the steam which accumulates in thesteam-dome passes down the connection 16a into the superheating tubes,and in assing through the tubes it beomesl super'eated by the hot gasesywithin said flue as will be obvious.

lIn both embodiments of my invention the withinl some In th forms of theinvention: too the. superheating tubes are perfectly. straight andwithout bends, and as a result they do not form such an obstruction inthe Hue 12 as to cause any danger of its being clolgged up with soot orashes.'

n the form of the invention 4shown in Fig. 4 I' have illustrated athrottle-valve 29 situated within the smoke-chamber which is controlledby a stem 30 which extends through one of the superheating tubes 13, andit' desired I may protect the portion of the st em which extends throughthe space above the crown-sheet by means of a tube or' pipe 40.

In Fig. 6 I have shown a construction similar to that shown in Fig. 4with the eX- ception that the connection 16" thrugh which the steam istaken from the steam dome to the superheating tubes is separated fromthe walls of the extension 33. This construction has the advantage thatthere is less danger of the wall of the extension 33 burning out at thepoint where the superheating tubes pass t erethrough than t ere is inthe construction shown in Fig. 4.

This application is a division of my copending application Se. No.243,356, filed January 30, 1905.

Having fully described my invention what I claim as new and desire tosecure by Letters Patent is 1. In a boiler, the combination with aboiler shell having a ire box at one end and a smoke chamber at theother, of an enlarged flue extending through said shell and com-.municating both with the smoke chamber `2l. The superheating tubes 13*arev located v vwithin 'the enlarged flue 12 and they cm- `75 90,1;'superheating' tubes are received partially' @within the enlarged Hue12and partially ortion of the combustion,

and fire box, superheating tubes extending through said Hue andprojecting at one end into the smoke chamber and at the other end intothe combustion chamber, means to connect the latter ends of the tubeswith the steam-generating compartment of the boiler, and a connection atthe other end of the tubes leading to the cylinders of the engine to beoperated.

` 2. In a boiler, the combination with a boiler shell having a fire boxat one end and a smoke chamber at the other, of superheating tubesextending through said shell and projecting at one end into thecombustion chamber-of the re box and at the other end into the smokechamber, means 'to protect said tubes from contact with the Water in theshell, means to connect the latter end of said tubes with thesteam-generating space of the boiler, and a connection at the other endof said tubes for delivering superheated steam therefrom.

3. In a locomotive boiler, the combination with a boiler shell having asmoke chamber at one end and a fire box at the other, of an enlargedflue extending through the shell and communicating at one end with thecombustion chamber of the fire box and at the other end with the smokechamber, superheating tubes extending through said flue and projectingat one end into said combustion chamber and at the other end into thesmoke chamber, means to connect the former end with the steam-generatingspaces of the boiler, and a connection with the other end of said tubesWithin the smoke chamber for delivering superheated steam therefrom.

4. In a boiler, the combination with a boiler shell having a re box atone end and a smoke chamber at the other, of an enlarged flue extendingthrough said shell and communicating both with the smoke chamber andlire box, a superheating tube extending through said flue and projectingat one end into the combustion chamber, means to connect said end of thetube with the steam-generating compartment of the boiler, and aconnection at the other end of said tube leading to the cylinder of theengine to be operated.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing Witnesses.

J. M. MGCLELLON.

Witnesses:

Louis C. SMITH, MARGARET A. DRUM.

